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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Liu, Yen-LiangSubject: search.filters.subject.visible light communication (VLC)

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Now showing 1 - 4 of 4
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    High Speed Imaging 3 x 3 MIMO Phosphor White-Light LED Based Visible Light Communication System
    (2016-12-01)
    Hsu, Chin-Wei
    ;
    Chow, Chi-Wai
    ;
    Lu, I-Cheng
    ;
    Liu, Yen-Liang
    ;
    Yeh, Chien-Hung
    The phosphor light-emitting diode (LED) has been widely used not only for indoor illumination but for the optical transmitter (Tx) as well in visible light communication (VLC). However, the transmission data rate is significantly limited by the modulation bandwidth of LED because of the low-speed response of phosphor. In order to enhance the data rate of the VLC system, we demonstrate a 3 x 3 imaging multiple-input multiple-output (MIMO) VLC system. Besides, the pre-equalizer circuit is used to extend the bandwidth of the LED Tx. Orthogonal frequency division multiplexing (OFDM) with bit-loading algorithm is used. By using the proposed scheme, the original 1 MHz bandwidth commercially available phosphor white light LED can achieve 1 Gbps data rate over 1-m free-space transmission distance.
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    Demonstration of High Speed Imaging 3x3 MIMO-OFDM Visible Light Communication System
    (2016-01-01)
    Hsu, Chin-Wei
    ;
    Lu, I-Cheng
    ;
    Liu, Yen-Liang
    ;
    Yeh, Chien-Hung
    ;
    Chow, Chi-Wai
    We experimentally demonstrate the 3x3 imaging multiple-input multiple-output (MIMO) visible light communication (VLC) system, using orthogonal frequency division multiplexing (OFDM) modulation and bit-loading, a total data rate > 800-Mbit/s over 1-m transmission is achieved without using blue-filter.
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    Investigation of phosphor-LED lamp for real-time half-duplex wireless VLC system
    (2016-06)
    Yeh, Chien-Hung
    ;
    Chow, Chi-Wai
    ;
    Chen, Hsing-Yu
    ;
    Liu, Yen-Liang
    ;
    Hsu, Dar-Zu
    In this investigation, a 71.3 to 148.4 Mbit s(-1) white phosphor-LED visible light communication (VLC) system is proposed and demonstrated under the practical transmission length of 140 to 210 cm. Here, a commercial white-light LED lamp with five cascaded phosphor-LED chips is utilized for illumination and communication simultaneously. In the measurement, we utilize the optical orthogonal frequency division multiplexing quadrature amplitude modulation (OFDM-QAM) with bit-loading algorithm and propose an optimal bias-tee circuit design to improve the modulation bandwidth from 1 MHz to 27 MHz. Moreover, a blue optical filter is not used on the client side. Finally, to realize and demonstrate the real-time transmission performance in the proposed LED VLC system, a commercial OFDM-based digital signal processor (DSP) chip is utilized on the LED lighting side and client side, respectively. Hence, the proposed real-time half-duplex VLC transmission could achieve the 70 Mbit s(-1) downstream and upstream data throughputs, under a practical transmission length of 200 cm.
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    High-Speed 2x2 MIMO-OFDM Visible Light Communication Employing Phosphorescent LED
    (2016)
    Lu, I-Cheng
    ;
    Liu, Yen-Liang
    ;
    Lai, Chih-Han
    ;
    光電工程學系
    ;
    Department of Photonics
    We experimentally demonstrated a 2x2 multiple-input multiple-output (MIMO) visible light communication (VLC) system using commercial phosphorescent white light emitting diodes (LEDs) and low-cost PIN photodiodes (PDs). Additionally, a pre-equalizer was used to extend the available modulation bandwidth up to 100 MHz. Using spectral-efficient orthogonal frequency division multiplexing (OFDM) modulation with bit-loading algorithm, we successfully achieved high-speed VLC transmission at > 1 Gbit/s over a free-space link of 0.6 m.